/Engine/Source/Runtime/Engine/Classes/Components/SkinnedMeshComponent.h
Finds a vector pointing along the given axis of the given bone
the direction of the specified axis, or (0,0,0) if the specified bone was not found
FVector GetBoneAxis ( [FName](API\Runtime\Core\UObject\FName) BoneName, [EAxis::Type](API\Runtime\Core\Math\EAxis__Type) Axis ) const